"the directory containing the classes", do you mean the directory containing the jars which I need to include? I found you said "classes", but there is no any class under my working diretory.

Yes, I did run in the directory containing the jars which I need to include.

from u ---"jar cfm <location of manifest> <location of jar> *.class"
since I run in the directory containing the jars which I need to include, and Manifest.txt is in the same directory, I don't need <location of manifest> <location of jar>, so I use:
jar cfm test.jar Manifest.txt *.class
I got :
*.class : no such file or directory